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People Who Have Had Gastric Surgery Gastric bypass surgery (like Roux-en-Y), sleeve gastrectomy, or other bariatric procedures significantly reduce the stomachs ability to produce intrinsic factor a protein required to absorb B12 in the small intestine
When your body lacks sufficient B12, you may experience symptoms like fatigue, weakness, numbness, or even anemia
References Lau DCW, Erichsen L, Francisco AM, et al
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